有三隊啦啦隊，總人數有１２０人。仁愛隊佔３５％，喜樂隊的人數比仁愛隊的多６人。其餘的則是和平隊，和平隊的人數佔總人數的百分之幾??
請列出步驟．．唔要呢個:１－（３５％＋（６／１２０ｘ１００％＋３５％））
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2008-01-09 4:33 am
回答 (3)
2008-01-11 8:51 am
Let x be peace(和平) team 's.
120*0.35+120*0.35+6+x=120
x=30
Peace team 's%:
30/120*100%
=25%
Ans: The percentage of peace team is 25%.
Linear equation:
Let x be peace team 's and y be the per.cent .
{ x/120*100%=y----------(1)
{42+48+x=120*(y+35%+40%)---------(2)
Form(1): x/120*100%=y
y=5x/6%-----(3)
Substitute y=5x/6% into (2)
42+48+x=120*(5x/6%+35%+40%)
90+x=120*5x/6%+42+48
90-90+x=120*5x/6%
x=30
Put x=30 into (3)
y=5*30/6%
y=25%
Ans: The per.cent of Peace team is 25%.
120*0.35+120*0.35+6+x=120
x=30
Peace team 's%:
30/120*100%
=25%
Ans: The percentage of peace team is 25%.
Linear equation:
Let x be peace team 's and y be the per.cent .
{ x/120*100%=y----------(1)
{42+48+x=120*(y+35%+40%)---------(2)
Form(1): x/120*100%=y
y=5x/6%-----(3)
Substitute y=5x/6% into (2)
42+48+x=120*(5x/6%+35%+40%)
90+x=120*5x/6%+42+48
90-90+x=120*5x/6%
x=30
Put x=30 into (3)
y=5*30/6%
y=25%
Ans: The per.cent of Peace team is 25%.
參考: me
2008-01-09 4:46 am
仁愛隊人數 = 120 X 35% = 42人
喜樂隊人數 = 仁愛隊 + 6 = 42 + 6 = 48人
和平隊人數 = 120 - 42 - 48 =30人
和平隊人數佔總人數百分比 = 30 / 120 X100 = 25%
喜樂隊人數 = 仁愛隊 + 6 = 42 + 6 = 48人
和平隊人數 = 120 - 42 - 48 =30人
和平隊人數佔總人數百分比 = 30 / 120 X100 = 25%
2008-01-09 4:45 am
120 - [(120 x 0.35) + 6 + (120 x 0.35)]/120
2008-01-08 20:46:19 補充：
ps: /120 姐係除120
2008-01-08 20:47:18 補充：
答案: 120 - 90 = 3030 / 120 = 25%@@
2008-01-08 20:46:19 補充：
ps: /120 姐係除120
2008-01-08 20:47:18 補充：
答案: 120 - 90 = 3030 / 120 = 25%@@
參考: 自己撞彩...
收錄日期: 2021-04-13 14:54:21
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https://hk.answers.yahoo.com/question/index?qid=20080108000051KK03564